Forum Discussion
Item validation based on 2 columns
Hello everyone, I want to avoid that users create the item twice in my SharePoint list "reporting". I want to validate that with 2 columns: "C-Code" (like US10) which is a lookup column "Peri...
philipp777 You cannot use the lookup columns in SharePoint validation formula. Also, you cannot check the column values of another list items in formula.
Best solution for you would be to customize the list forms using Power apps & add these validation in forms using power apps formulas.
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